This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 147 |
| 4 | 7071 |
| 5 | 1012315 |
| 6 | 437241277 |
| 7 | 563330031268 |
| 8 | 2154370064869978 |
| 9 | 24591601562099287015 |
| 10 | 837044464889796587986014 |
| 11 | 84914857903369744218835564258 |